Alfred n



A. N. PARNALL.

ROTARY ENGINE.

No. 419,062. Patented Jan. 7, 1890.

s G. ,J .k F A J 7 1 FIG-2- N. PETERS. Phummhc n hnr, Wahingkm. D. c.

UNITED STATES PATENT OFFICE.

ALFRED N. PARNALL, OF DENVER, COLORADO, ASSIGNOR OF ONE-HALF TO JAMES V. JAOKSON, OF SAME PLACE.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent N 0. 419,062, dated January 7, 1890.

Application filed August 15, 1889- Serial No. 320,813. (No model.)

To all whom it may concern: its inner end is provided with two opposite Be it known that I, ALFRED N. PARNALL, a steam-ports f f, which also extend through citizen of the United States, residing at Denthe cylinder A to opposite points thereof. ver, in the county of Arapahoe and State of F is a valve encircling trunnion a, adja- 5 Colorado, have invented certain new and usecent to the box (L This valve is provided ful Improvements in Rotary Engines; and I with a steam-chamber f and an outer or exdo hereby declare the following to be a full, haust chamber f and also with an automatic clear, and exact description of the invention, or variable cut-off G, having a handle 9 prosuch as willenable others skilled in the art jecting through a slotg of valve F. By IO to which it appertains to make and use the means of cut-off G the space between the opsame, reference being had to the accompanyposite upper ends of steam-chamber f can be ing drawings, and to letters of reference increased or diminished, and by means thereof marked thereon, which form a part of this the feed of steam through ports f will be out specification. off at an earlier or later point of the stroke. I 5 This invention pertains to certain new and In Fig. 2 I have shown cylinder A as prouseful improvements in rotary engines; and vided with side chambers I-I, designed for it consists in a stationary shaft and crank clearance of cross-head E and to permit of upon which is secured,so as to revolve thereaccess to adjust wedge-key e. around,areciprocating piston moving within A pressure of steam or other elastic fluid 7o 20 a cylinder revolving on two journals or trun admitted through one of the ports f will pass nions, substantially as hereinafter fully set into the upper end of cylinder A, and the re forth, and particularly pointed out in the sulting pressure upon the face of piston D claims. operating obliquely against stationary crank In the accompanying drawings, Figure 1 is 61 causes said cylinder to rotate. The exhaust- 25 a vertical longitudinal sectional view of my steam from the lower end of cylinderA passes improved rotary engine. Fig. 2 is a transfrom the lower port through the exhaust verse sectional view thereof. Fig. 3 is a secchamber into the outer atmosphere. tional detail on the line a: as, Fig. 1. I claim as my invention Referring to the drawings,A designates the 1. In a rotary engine, the combination of o revolving cylinder, provided at its ends with the stationary shaft having an inner crank trunnions a a, which are secured in journalend, the piston having a transverse opening boxes a a supported by stanchions B. and secured on said crank end, and the cyl- Q is a stationary shaft having a crank end inder inclosing said piston and having the (Z, said shaft being passed through trunnion same axial hearing as said shaft, substantially 8 5 3 5 a and a stuffing-box d. A set-screw (Z Workas set forth.

ing in journal-box c bears upon this shaft 2. 111 a rotary engine, the combination of and holds the same rigidly in position. the stationary shaft having an inner crank D is a piston provided with opposite cenend, the piston having a transverse opening, tral plates (1 d having steel or other me the two-part box or cross-head securing said 0 4o tallic facings c. This piston is secured upon crank end in said opening, and the cylinder the crank end (Z of shaft C, said crank being inclosing said piston and having the same inclosed in a two-part box or cross-head E, axial bearing on said shaft, substantially as secured between the opposite edges of plates set forth. (1 by means of awedge-key e. Alarge open- 3. In a rotary engine, the combination of 5 ing 6 is formed in one face of piston D, and the stanchions, thestationary shaft supported through it shaft 0 is designed to project. by one of said stanchions and having an in- \Vithin the chamber e formed by the plates ner crank end, the piston secured on said 61 and one side of the cylinder, oil or other crank end, and the cylinder inclosing said lubricant is placed. Trunnion a is cast with piston and having trunnions supported by I00 50 or otherwise secured to cylinder A and opersaid stanchions, substantially as set forth.

ates within journal-box (L This trunnion at 4. In a rotary engine, the combination of thestanehions, the stationary shaft supported der having end trunnions, one of which is by one of said stanehions, the piston secured provided with steam-ports, the valve ineloson theinner end of said crank, and having a ing said latter trunnion, and the variable eutcentral transverse opening, and the cylinder off, substantially as set forth.

5 inelosing said piston and provided with end In testimony whereof Iaffix my signature in 15 trunnions and steam-ports, substantiaily as presence of two Witnesses. setforth. ALFRED N. PARNALL.

5. In a rotary engine, the combination of Witnesses: the stationary shaft, the reciprocating piston FREMONT STANsBURY,

IO secured on the inner end thereof, the cylin- EDWIN M. BROWN. 

